Robert nicoll



No. 28,596, PATENTED JUNE 5, 1860 R. NIGOLL.

STEAM AND WATER 000K.

Jul/(271157":

UNITED STATES PATENT OFFICE.

ROBERT NICOLL, OF NEW YORK, N. Y.

STOP-COCK.

Specification of Letters Patent No. 28,596, dated June 5, 1860.

To all whom it may concern:

Be it known that 1, ROBERT NIeoLL, of the city, county, and State of NewYork, have invented a new and Improved Steam and Water Cock; and I dohereby declare that the following is a full, clear, and exactdescription of the same, reference being had to the annexed drawings,making a part of this specification, in which Figure 1, is alongitudinal central section of my invention. Fig. 2 a detached end viewof a valve of the same.

Similar letters of reference indicate corresponding parts in the twofigures.

' The object of this invention is to obtain a cock which will have itspassage within obstructed in a much less degree than usual by thevalve-seat. The seats of ordinary cocks as is well known require to beof a certain degree of thickness in order to bear or sustain thepressure of the valve and this thickness acts as a great obstruction tothe passage of the water or steam through the cock. In order to obviatethis difiiculty I employ two valves placed on a single stem providedwith right and left screws, the valves being placed at opposite sides ofa seat and made simultaneously to approach and recede from it by theturning of the stem. The two valves pressing on opposite sides of theseat enable me to employ a very thin seat as the same will not be liableto be bent, fractured, or broken, in consequence of the equal pressureat both sides of the seat.

To enable those skilled in the art to fully understand and construct myinvention I will proceed to describe it.

A represents the body or tube of the cock, and may be of the usual form,and B, B, are two recesses or cylindrical chambers one above the otherand one communicating with the inner part of the tube by means of apassage a, and the other communicating with the outer part of the tubeby a pas sage Z).

The chambers B, B, are divided by the valve seat 0, which is quite thinas shown clearly in Fig. 1, and is in a horizontal position, 0, is avalve stem which is fitted vertically in the cock within the chambers B,B. This stem G, passes through the seat 0, and

which valves D, E, are placed, one on each screw. These valves D, E, aresimply nuts provided each with two projections or guides e, e, which fitin grooves f, in the chambers B, B, and while permitting the valves torise and fall freely in their respective chambers prevent them fromturning therein. The face sides of the valves D, E, are parallel witheach other and have plane surfaces and the valves are placed on theirscrews (Z, (Z, equidistant from the seat 0.

The upper end of the stem C, is fitted within an arbor F, which isprovided with a collar (Z, and has a cap 6, fitted on it, said cap beingscrewed on the upper chamber B. The upper part of the stem C, is fittedin the arbor F, and secured therein by a key or pin 7, a collar g, isalso placed on the upper part of the stem said collar being fitted in agrooved recess h, in the upper end of the chamber B.

From the above description it will be seen that byturning the arbor F,which passes through the cap 6, of cylinder B, the valve stem C, will beturned and the valves D, E, moved by the action of the screwssimultaneously toward and from the seat 0. Then the valves are broughtin contact with the seat the cock of course is closed, and the seat issubjected to an equal pressure at both sides of it.

By this arrangement a very thin seat 0, may be employed and consequentlythe passage through the eock is less obstructed than usual as thepassages a, b, will be of greater area owing to the diminished thicknessof the valve seat.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is.

The employment or use of two valves D, E, placed at opposite sides ofthe seat 0, and made to move simultaneously toward and from the seat bymeans of the right and left screws, or their equivalents for the purposespecified.

ROBERT NICOLL.

Witnesses CHARLES HUGHES, WM. THOMPSON.

